收藏本站
参数资料
型号： M34518E8SP
元件分类： 微控制器/微处理器
英文描述： 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDIP32
封装： 8.90 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32
文件页数： 88/162页
文件大小： 1149K
代理商： M34518E8SP
Rev.3.01
2005.06.15
page 29 of 157
REJ03B0008-0301
4518 Group
(5) Notes on External 1 interrupt
Note [1] on bit 3 of register I2
When the input of the INT1 pin is controlled with the bit 3 of reg-
ister I2 in software, be careful about the following notes.
Depending on the input state of the P31/INT1 pin, the external 1
interrupt request flag (EXF1) may be set when the bit 3 of regis-
ter I2 is changed. In order to avoid the occurrence of an
unexpected interrupt, clear the bit 1 of register V1 to “0” (refer to
Figure 21) and then, change the bit 3 of register I2.
In addition, execute the SNZ1 instruction to clear the EXF1 flag to
“0” after executing at least one instruction (refer to Figure 21).
Also, set the NOP instruction for the case when a skip is per-
formed with the SNZ1 instruction (refer to Figure 21).
LA
4
; (02)
TV1A
; The SNZ1 instruction is valid ...........
LA
8
; (12)
TI2A
; Control of INT1 pin input is changed
NOP
...........................................................
SNZ1
; The SNZ1 instruction is executed
(EXF1 flag cleared)
NOP
...........................................................
: these bits are not used here.
Fig. 21 External 1 interrupt program example-1
Note [2] on bit 3 of register I2
When the bit 3 of register I2 is cleared to “0”, the RAM back-up
mode is selected and the input of INT1 pin is disabled, be careful
about the following notes.
When the input of INT1 pin is disabled (register I23 = “0”), set the
key-on wakeup function to be invalid (register K22 = “0”) before
system enters to the RAM back-up mode. (refer to Figure 22).
LA
0
; (02)
TK2A
; Input of INT1 key-on wakeup invalid ..
DI
EPOF
POF
; RAM back-up
: these bits are not used here.
Fig. 22 External 1 interrupt program example-2
Note on bit 2 of register I2
When the interrupt valid waveform of the P31/INT1 pin is
changed with the bit 2 of register I2 in software, be careful about
the following notes.
Depending on the input state of the P31/INT1 pin, the external 1
interrupt request flag (EXF1) may be set when the bit 2 of regis-
ter I2 is changed. In order to avoid the occurrence of an
unexpected interrupt, clear the bit 1 of register V1 to “0” (refer to
Figure 23) and then, change the bit 2 of register I2.
In addition, execute the SNZ1 instruction to clear the EXF1 flag to
“0” after executing at least one instruction (refer to Figure 23).
Also, set the NOP instruction for the case when a skip is per-
formed with the SNZ1 instruction (refer to Figure 23).
LA
4
; (02)
TV1A
; The SNZ1 instruction is valid ...........
LA
12
; (12)
TI2A
; Interrupt valid waveform is changed
NOP
...........................................................
SNZ1
; The SNZ1 instruction is executed
(EXF1 flag cleared)
NOP
...........................................................
: these bits are not used here.
Fig. 23 External 1 interrupt program example-3
相关PDF资料
PDF描述
M34518M2-XXXFP 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP32
M34519M6-XXXFP 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42
M34519M8-XXXFP 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42
M34519E8FP 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO42
M34519M8-XXXFP 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42
相关代理商/技术参数
参数描述
M34518M2-XXXFP 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34518M2-XXXSP 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34518M4-XXXFP 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34518M4-XXXSP 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
M34518M6-XXXFP 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*